Vacuum-drier.



PATENTED SEPT. 11, 1906. E PASSBURG VACUUM DRIER.

APPLICATION FILED JULY 27 1905 Invenior:

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"drum does not come into contact, owing to the such as paints and the like.

UNITED srA-rns PATENT OFFICE.

EMIL PAssBURe, or BERLIN, GERMANY.

VACUUM-DRIER.

- Specification of Letters Patent.

Patented Sept. 111, 1906.

Application filed-Tuly 27,1905. Serial median.

vacu'um-driers.

The known vacuum-driers in which heated rotary drying-drums are used are highly suitable for drying various liquid or semibut are not suitable for liquid .substances,

treating substances the'solid constituentsof which rapidly settle or form deposits, as is, for. instance, the case with past mixtures,

' ith semiliquid masses of this kind the deposits formed settle at the bottom of the vacuum-chamber in more or less thick layers, with which the fact that for eflicicnt workingthe said drum must only extend into the mass to a comparatively slight depth, and therefore only The object of this invention is to remove this disadvantage and' toallow of producing with perfect efficiency vacuum-drying appaacts on the upper liquid layers, which gradually become poorer in mechanical admixtures, so that uniform and complete drying-is prevented.

ratus of the kind referred to for dryin liquid substancesin which sediments oreposits are rapidly formed. The means adopted for this pur ose according to the present invention su stantially consist in continuously stirring or agitating the liquid mass at the bottom of the vacuum-chamber and that the solid constituents about to be deposited are dis ersed and brou ht into contact with the we 1s of the rotary rum.

The stirrin and agitating of, the liquid" mass can be e ected by means of any suitable known device-for instance, by means of the device illustrated in the annexed drawings, in

whichuseful Improvements in are provided -0 which pipes may extend in presence of two Witnesses.

Figure 1 is a cross-section, and Fig. 2 a longitudinal section, of the improved apparatus.

The vacu -chamber a is provided at its lower part with bearings for the axles b,'which with blades 0 or the like, so arranged that they mesh with each other and that during the rotation of the axles the outer edges of the lower blades pass within a very short distance of the bottom of the chamber a, and thus eifectively prevent the formation of a deposit on the said bottom.

One of the axles b is connected, by means of the gear-train e, with the axle d of the drying-drum and serves, to drive the other axles b by means of suitable toothed wheels. The drying-drum may beheated by any suitable means, such as a hot fluid, introduced through ipe f and discharged through a pipe g, both through the axles of the drying-drum.

What I claim as my invention, and desire to secure by Letters Patent of, the United States, is v y 1. In an apparatus for drying liquid substances containing rapidly-settling solid con- 7 stituents, the combination of" a casing to hold the li uid, an inner drum adapted to rotate throug the liquid, and means independent of the drum for stirring the liquid at the [bottom of the casing.

2. In an apparatus for drying in 'vacuo liquid substances containing rapidly settling solid constituents, the combination of a cylindrical casing to hold the liqull, an inner drum adapted to rotate through the liquid, and blades adapted to rotate through the liquid between-the drum and the bottom of the casing.

In testimonywhereof I affix my signature EMIL P As'sBURG. Witnesses: WOLDEMAR HAUPT,

Louis LIEBENTHAL. 

